Abstract Preparation, structure and superconducting properties of Pb, K and Rb-doped BaBiO 3 are described. The low temperature specific heat results, it is emphasized, concern the complete existing concentration ranges of the systems. No pronounced specific heat peak can be observed at T c and there is no evidence of a significant linear temperature dependence term. The Debye temperature θ D varies continuously with the concentration of the dopand, which is in favour of a view of superconductivity relating it to high-frequency optic modes.